feat: add Docker Compose, environment template and README

.env.example

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+# ---------------------------------------------------------------------------
+# Pastor Online — configuração
+# Copie este arquivo para `.env` e ajuste os valores:
+#   cp .env.example .env
+# ---------------------------------------------------------------------------
+
+# Porta do frontend no host (http://localhost:8080)
+FRONTEND_PORT=8080
+
+# ---------------------------------------------------------------------------
+# Provedor de LLM: ollama | openai | groq | anthropic
+# ---------------------------------------------------------------------------
+LLM_PROVIDER=ollama
+
+# --- Ollama (local, requer o profile "local": docker compose --profile local up) ---
+OLLAMA_BASE_URL=http://ollama:11434
+OLLAMA_MODEL=qwen2.5:1.5b
+
+# --- OpenAI ---
+OPENAI_BASE_URL=https://api.openai.com/v1
+OPENAI_MODEL=gpt-4o-mini
+OPENAI_API_KEY=
+
+# --- Groq (compatível com a API da OpenAI) ---
+GROQ_BASE_URL=https://api.groq.com/openai/v1
+GROQ_MODEL=llama-3.3-70b-versatile
+GROQ_API_KEY=
+
+# --- Anthropic ---
+ANTHROPIC_BASE_URL=https://api.anthropic.com
+ANTHROPIC_MODEL=claude-sonnet-4-5
+ANTHROPIC_API_KEY=
+
+# ---------------------------------------------------------------------------
+# Embeddings (CPU)
+# paraphrase-multilingual-MiniLM-L12-v2: multilíngue, ~470 MB
+# all-MiniLM-L6-v2: menor e mais rápido, ~90 MB, apenas inglês
+# ---------------------------------------------------------------------------
+EMBEDDING_MODEL=paraphrase-multilingual-MiniLM-L12-v2
+
+# ---------------------------------------------------------------------------
+# Busca
+# ---------------------------------------------------------------------------
+TOP_K=6
+MIN_SIMILARITY=0.35
+
+# ---------------------------------------------------------------------------
+# OCR (necessário quando o PDF não tem camada textual utilizável)
+# ---------------------------------------------------------------------------
+OCR_DPI=200
+OCR_LANGUAGE=por+eng
+OCR_TIMEOUT=120
+OCR_WORKERS=4
+
+# ---------------------------------------------------------------------------
+# API
+# CORS_ORIGINS=http://localhost:8080,http://127.0.0.1:8080
+# REINDEX_TOKEN=troque-por-um-segredo
+# AUTO_INDEX=true
+# ---------------------------------------------------------------------------
+CORS_ORIGINS=http://localhost:8080,http://127.0.0.1:8080
+REINDEX_TOKEN=
+AUTO_INDEX=true